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(No Model.) 2 Sheets-Sheet l.

J. W. ROBBINS. GIRGULAR SAWING MACHINE.

Patented Sept. 30, 1884.

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2 Sheets-Sheet 2.

(No Model.)

J. W. ROBBINS. CIRCULAR SAWING MACHINE.

Patented Sept. '30, 1884.

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JAMES WEBSTER ROBBINS, OF ST. JOHNSBURY, VERMONT.

CIRCULAR SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 305,760, dated September 30, 1884:.

A pplicaiion filed May 5, 1891.

To ctZZ whom, may concern.-

Be it known that I, Janus Wnns'rnn tonjnINs, of- St. Johnsbury, in the county of Caledonia, of the State of Vermont, have invented a new and useful Improvement in Machinery for Sawing; and I do hereby declare the same to be described in the following specification, and represented in the accompanying drawings, of which-- Figure l is a top view, Figs. 2 and 3 opposite side elevations, Figs. 4 and 5 opposite end views, and Fig. 6 a longitudinal and ver' tical section, of a machine embodying my invention, the nature of which. is defined in the claim hereinafter presented.

In the drawings, A denotes the frame for supporting the main operative parts to be described. In the upper part of such frame are two parallel and horizontal rails, a a, over and upon which is a carriage, B, provided with wheels I), to rest and run on such rails. Supported. on the said carriage is a platform, C, movable toward and from the circular saw 1) by means of an adiustingscrew, e, suitably adapted to the carriage and platfori'n. Along the middle of such platform, and opening out of the rear end of it, is a dovetailed groove, d, besides which there are in the platform two curved slots, 0 andf, whose centers of curvature are the pivots h of the straight and movable gages E and F, such gages being placed on the platform at its opposite edges, and provided with clamp-screws t, that go through the slots and screw into the said gages. The saw 1) extends upward between the platform 0 and an auxiliary platform or table, G, which at one end is hinged to a slotted slide, II, arranged as represented, and held to the frame A by clamp-screws 7: going through the slot Z of such slide and screwed into the said frame. The table G can be turned upward and backward from over the said arbor, as occasion may require, for access thereto or to the parts adjacent to it. Furthermore, by its connection with the frame the table can be moved toward and away from the saw, in order to ad mit of such saw being inclined more or less to the plane of such table and to that of the platform C. The saw-arbor shown at m is supported in boxes at 0, sustained by a frame, I, that near the saw is pivoted to another frame,

-on the driving-belt 0.

(No model.)

1C, applied to stationary posts or standards L L, the frame and standards having meeting inclined faces 7s and Z, whereby the frame is arranged so as to be movable upward or downward on the standards, in a plane inclined to the horizon, to a degree that will prevent the driving-belt o of the smv-arbor from becoming slackened on its pulleys p and g while the frame Ii is being raised or lowered by means of a screw, 1-, suitably adapted to it, and a bar. a, connecting the two standards L L at their feet. A heavy roller, a, supported by aframe, b pivoted on a rod, 0", extending from one to the other of the posts or standards L L, rests To such -frame b a weight may be attached by a hook, d extending down from the said frame. The weight and roller serve to keep the belt tight under ordinary atmospheric or thermal changes or in case of its becoming stretched in use.

In the frame K. there is a slot, t, whose radius of curvature has its center in the axis of the pivots of the saw-frame I. A bracket, u, projectingfrom the frame K, supports a shaft, a, provided at its outer end with a hand-wheel, 'w, and at its inner end with a beveled pinion, m, such pinion being to engage with a bevelgear, 9 fixed on a screw, 2, that, pivoted in the bracket, extends upward and screws into a nut, a, connected with or pivoted'to the frame I. 3y revolving the hand-wheel the saw-frame I may be tipped to cause the saw to stand, and when in operation to cut in a plane more or less inclined to the horizon, as occasion may require.

The driving-pullcy q of the endless belt 0 is fixed on the shaft '1), arranged as'shown, and

provided with a fast pulley, c, and a loose \Vith the machine above described a piece of board applied to the platform 0 and extended therefrom upon the auxiliary platform may be sawed.

I am aware that a saw has been arranged with its arbor at an angle to the horizon, and

that such saw has been arranged so as to be arranged for adj nstinent, as described, the combination, with such a saw, of the platform 0, adjustable to or from the saw, and in the same plane therewith, and the auxiliary platform I 5 (l, adjustable similarly, and also adapted to be swung upward, as and for the purpose set forth.

J AMES \"VEBSTER ROBBINS. Wi tn esses CALVIN HORRILL, S. L. MORRILL. 

